HackingFinancial ServicesHealthcareFinanceVulnerability ExploitData ExfiltratedSupply Chain (3P Vendor)Identity (basic)Government IDPIIMediumContained

Delta Dental Plans Association

bd_c5ec0624c51b2f4e · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 21, 2023

Filed

Oct 27, 2023

To disclose

14 weeks

Affected

38state residents only

Confidence

65%

MasTec Care Opt Plus Plan notifies Montana residents that Delta Dental Plans Association, a third-party administrator, experienced a security incident involving the MOVEit file transfer application. Unauthorized actors downloaded data between May 27-30, 2023. Data included names, SSNs, DOBs, and contact info. MasTec discovered the incident on July 21, 2023, and sent notifications on October 27, 2023. Credit monitoring is offered.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 55 days

discovery → filing · 14 weeks / 98 days

May 27, 2023

Begins

Jul 21, 2023

Discovered

Oct 27, 2023

Filed

vs. sector median

+5 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed38 affectedView incident

Name: MASTEC, INC.
norm: mastec
Domain: mastec.com

Name: Delta Dental Plans Association
norm: delta dental plans association
Domain: mastec.com
Industry: Financial ServicesllmHealthcarellm

Discovered: Jul 21, 2023
Breach occurred: May 27, 2023 – May 30, 2023
Undetected for: 55 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 27, 2023
Affected individuals: 38state-resident count only
Data types: Identity (basic)Government IDPII
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Third party: via Delta Dental Plans Association
Initial access: exploit_public_facing

During the incident: Launched an investigation to determine the potential impact
Retained outside advisors and cybersecurity experts
Completed investigation and confirmed personal information was impacted
Offering credit monitoring for two (2) years at no cost through Experian
Offering complimentary 24-month membership of Experian’s IdentityWorks
Changes made: Delta Dental took the affected application offline
Updated systems to secure vulnerabilities and prevent further access
Delta Dental implemented corrective actions to help protect your information from further security incidents
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(98 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-802.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 27, 2023
Raw hash: 2dd496b4b12be5e3ba10ef00555006d189a66bd009fe99e9370984f2800fe503

Reporting entityMASTEC, INC.

Victim entityDelta Dental Plans Association

Incidentdiscovered Jul 21, 2023

Stated responseLaunched an investigation to determine the potential impact

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov